• Temporalis muscle pulls jaw to ipsilateral side
• Masseter muscle pulls jaw to ipsilateral side
• Medial pterygoid pushes jaw to contralateral side
• Lateral pterygoid pushes jaw to contralateral side

Muscles on the outside of the skull will pull the lateral jaw ipsilaterally

Muscles on the inside of the skull will pull the lateral jaw contralaterally

Example: Right lateral excursion:

• Right temporalis and right masseter
• Left medial pterygoid and left lateral pterygoid
   

TREATMENT

Jaw thrusting/protrusion

Treat the medial and lateral pterygoids:

• Medial pterygoid
• Lateral pterygoid

Jaw retraction

• Posterior fibres of the temporalis, intermediate and deep fibres of the masseters, anterior digastric

Jaw deviation dystonia¹

• Temporalis muscle (anterior fibres) on the side to which the jaw deviates
• Lateral pteryoid on the opposite side to the direction of deviation